Perhaps a leafcutter bee?
Insect is constructing a dwelling out of mud/sand within the casing of a window.
Possibly, Genus Exoneura
However, I don’t think my images are clear enough to determine this.
As you can see in image 2 there is a Milky Flower Spider to the right. I sat and watched expecting the Spider to grab the Bee. To my surprise the Spider didn’t budge and showed no interest at all. Perhaps she had already had a feed.
Approximately 1cm. Found in laundry,climbing up cupboard. Frequently, raised abdomen and rubbed back legs together, as seen in image 4.
On the railing of a bridge. NOT sure of identification but this was the only thing suggested by the machine-reader that looked possible.